Brush Cutter Workshop Manual

19
3
Fuel system
Remove the throttle cable and fuel hose
from the carburettor.
Remove the carburettor.
Remove the throttle cable from the
carburettor’s lever arm using flat nose
pliers.
Pull off the fuel hose and remove the
carburettor.
Tip!
Open the fuel cap to avoid fuel spillage
caused by any excess pressure.
Attach the fuel hose to the return
nipple.
The carburettor is made by Zama.
Design, function and servicing corre-
spond with the Walbro carburettor.
Default carburettor settings:
H = 1 revolution open
L = 1 revolution open
The carburettor needles are fitted with
movement limiters (caps).
The carburettor is made by Zama.
It has the same design and function as
the Walbro carburettor, which means
that servicing is also carried out in the
same way.
The lever arm should lie flush with the
carburettor housing’s contact face.
Default carburettor settings:
H = 1 revolution open
L = 1 revolution open
The carburettor needles are fitted with
movement limiters (caps).
The carburettor’s design
The carburettor can be divided into
three different functional units: the
metering unit, the blending unit, and the
pump unit.
The metering unit
The needles and the fuel control
functions are located here.
The carburettor’s design
The carburettor can be divided into
three different functional units: the
metering unit, the blending unit, and the
pump unit.
The metering unit
The needles (A) and the fuel control
functions are located here.
The needle valve (B) and control
diaphragm (C) are vital to the carburet-
tor’s function.
The blending unit
Fuel and air are mixed here.
The blending unit
In this section of the carburettor fuel
and air are mixed in the proper propor-
tions.
The choke and throttle valves are
placed here.
In the middle of the venturi (narrowest
part of the throughput) the main jet (D)
is found.